Cleveland
Cleveland C54089 Straight Flute Hand Tap #2-56 UNC Taper HSS 1.75 in
Creates #2-56 UNC threads with a 1.75 in high-speed steel taper tap featuring a .44 in thread length and H2 limit for 2B class fit
- Straight flute clears chips in through holes
- #2-56 UNC thread cuts fine machine screws
- Taper lead starts threads easily by hand
- High-speed steel resists wear on repeated cuts
- 75 % thread drill size 1.73 mm guides drilling
Cleveland #2-56 UNC Straight Flute Hand Tap
This Cleveland C54089 straight flute hand tap cuts internal #2-56 UNC threads in through-holes or blind holes. The taper chamfer eases starting and helps alignment in softer materials. Made from high-speed steel with a bright uncoated finish, it suits general-purpose threading in steel, aluminium and plastic. Right-hand threads follow the standard 2B class of fit.
Practical limits of a taper hand tap
The 0.44 in thread length and 1.75 in overall length restrict reach to shallow holes. Taper chamfers need more turns to reach full depth, so they are slower than plug or bottoming styles. The 75 percent thread drill size of 1.73 mm leaves limited chip clearance in deep or sticky materials. H2 thread limit and 2B class give standard tolerance but no oversize allowance for plating or heat expansion.
Installation notes and common issues
Start the tap square to the workpiece using a tap wrench or guide to avoid bell-mouthed threads. Use cutting fluid and back the tap frequently to break chips in blind holes. A drill larger than 1.73 mm reduces thread height; a smaller drill increases torque and breakage risk. The bright finish can gall in stainless steel without lubricant. Do not force the tap once resistance spikes.
Highlights
- Straight flute clears chips in through holes
- #2-56 UNC thread cuts fine machine screws
- Taper lead starts threads easily by hand
- High-speed steel resists wear on repeated cuts
- 75 % thread drill size 1.73 mm guides drilling
Specifications
| Brand | CLEVELAND |
|---|
Questions about this item
Should I choose the taper version or a different chamfer for this #2-56 UNC tap?
The taper chamfer gives a long lead that starts threads easily in through holes and is the standard first tap for hand threading with a 1.75 in overall length.
What does the 56 threads-per-inch figure mean when I use this tap in a real workpiece?
It produces a #2-56 Unified Coarse thread with a .44 in thread length and a class 2B fit when drilled with the 1.73 mm tap drill.
How does the H2 thread limit affect what this tap can cut?
The H2 limit sets the pitch-diameter tolerance for a class 2B internal thread, so the tap cuts within the standard allowance for general-purpose UNC fastening.
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